摘要
采用田间统计绿期法、电导率法和匍匐茎恢复生长法,对50份西南部野生狗牙根(Cynodon dactylon)和2份美国引进品种(Tifway和Tifeagle)进行耐寒性初步鉴定。结果表明:1)52份材料的绿期为277~306 d,Sau02033(越西)、Sau02040(自贡)的绿期最长;2)半致死温度(LT50)为-9.00^-1.72℃,Sau02014(金川)、Sau02040(自贡)的LT50最低;3)匍匐茎恢复生长率为18.05%~42.36%,Sau02012(金川)、Ly97021(遂宁)的恢复率最高;4)偏相关分析结果表明,其耐寒性与海拔显著正相关(P<0.05);5)将52份材料系统聚类分为A、B、C三类,耐寒性强弱表现为A>B>C,Tifway和Tifeagle被聚在C类,大部分野生材料的耐寒性高于这两个品种。综上可知,3种方法综合评定结果表明,Sau02040(自贡)、Sau02013(金川)、Sau02014(金川)、XZ2(察隅)耐寒性较强,具有良好的牧草和草坪草开发潜力,3种指标综合运用更能全面评价狗牙根的耐寒性。
The cold tolerance of Bermudagrass(Cynodon dactylon),including 50 native accessions in Southwest China and 2 introduced varieties(“Tifway”and“Tifeagle”),was studied using methods including the green period,semi-lethal temperature,and stolon regrowth experiments.The following results were obtained:1)A green period for the 52 accessions ranging from 277 days to 306 days,with Sau02033(Yuexi)and Sau02040(Zigong)having the longest green periods;2)Semi-lethal temperatures(LT50)ranged from-9.00℃ to-1.72℃,and the LT50 of Sau02014(Jinchuan)and Sau02040(Zigong)were the lowest;3)Survival rates ranged from 18.05% to 42.36%,and the survival rates of Sau02012(Jinchuan)and Ly97021(Suining)were the highest among all accessions;4)The results of the partial correlation analysis indicated that there was a significant correlation between the cold tolerance and altitude(P<0.05);5)52 bermudagrass accessions were clustered into three groups:A,B,and C,in which the cold tolerance was A>B>C.Both“Tifway”and“Tifeagle”were clustered into group C,whereas most of the native accessions showed a higher level of cold tolerance compared to the two introduced ones;6)According to the comprehensive results of the three methods,Sau02040(Zigong),Sau02013(Jinchuan),Sau02014(Jinchuan),and XZ2(Tibet)were the top performers,from which excellent forage and turfgrass can be obtained.The cold tolerance of bermudagrass could be better evaluated using the three reference indicators above.
作者
袁小情
严国强
黄思怡
王芮嘉
李鸣曦
杨丹
张新全
刘伟
YUAN Xiaoqing;YAN Guoqiang;HUANG Siyi;WANG Ruijia;LI Mingxi;YANG Dan;ZHANG Xinquan;LIU Wei(Department of Grassland Science,Sichuan Agricultural University,Chengdu 611130,Sichuan,China)
出处
《草业科学》
CAS
CSCD
2020年第2期287-297,共11页
Pratacultural Science
基金
四川省教育厅重点项目(18ZA0387)
关键词
狗牙根
绿期
半致死温度
匍匐茎恢复生长
电导率
耐寒性
Cynodon dactylon
green period
semi-lethal temperature
stolon regrowth
relative electrical conductivity
cold tolerance
作者简介
第一作者:袁小情(1994-),女,四川高县人,在读硕士生,主要从事草坪草逆境生物学研究。E-mail:1443924964@qq.com;通信作者:刘伟(1974-),男,四川犍为人,副教授,博士,主要从事草坪培育和草地管理研究。E-mail:lwgrass@126.com。
